<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <title>对象扩展</title>
</head>

<body>

  <script>
    // 1. Object.is 判断两个值是否完全相等
    console.log(Object.is(120, 110)); // false
    console.log(Object.is(120, 120)); // true
    console.log(Object.is(NaN, NaN)); // true
    console.log(NaN === NaN); // false

    // 2. Object.assign 对象的合并
    const config1 = {
      host: 'localhost',
      port: 5000,
      name: 'root',
      pass: 'root',
      test: 'test'
    }

    const config2 = {
      host: 'http://atguigu.com',
      port: '8080',
      name: 'atguigu.com',
      pass: 'atguigu'
    }

    console.log(Object.assign(config1, config2))

    // 3. Object.setPrototypeOf 设置原型 Object.getPrototypeOf
    const school = {
      name: '尚硅谷'
    }
    const cities = {
      xiaoqu: ['北京', '上海', '深圳']
    }

    Object.setPrototypeOf(school, cities);
    console.log(Object.getPrototypeOf(school));
    console.log(school)
  </script>
</body>

</html>